284 



INDEX 



Eat, size of litters of, 109 

 Reduction of heterozygous individ- 



uaJa and allelomorphic pairs, 90 

 Remick, 92 



Reproduction, among animals and 

 plants, 20 



asexual, 17, 21, 22, 30, 78 • 



sexual, 17, 20f., 26, 201, 205 



eexual, origin of, 26^. 

 Retina, pigmentary degeneration of, 



231 

 Bhopalura, 2G 

 Rice, 114 

 Ripley, 257 



Ritzema-Boa, lOlff., 188 

 Roberts, 153 

 Robbins, 92 

 Roman Empire, 259 

 Romans, 259 

 Rome, 251 

 Rommel, 110 

 Rosaoew, 32 

 Rotifer, 158, 170, 202 



SaocuUna, 23 ^ 



Sageret, 141, 144, 156, 192 



Sax, 157 



Saxons, 258, 260 



Scandinavians, 257 



Schizophytes, 26 



School for mothers, 227 



Scotch, 259f. 



Scotland, 257, 260 



Sex, determination of, iSff. 



Sexual dimorphism, 26 



Self-fertilization as means of obtain- 

 ing homozygosity, 97 



Self-sterility, 25, 33 



Sex-linked characters, 47^. 

 inheritance of, iSf. 



Sex, origin of, 201 



Sex ratio, 106 



Shamel, 119 



Sheep, 210ft. 



Shull, A. F., U2f., 158, 169 



Shull, G. H., nsff., 168/. 



Silkworms, 158 

 Spain, 257/. 

 Spaniard, 262 

 Spermatogenesis, 37 

 Spermatozoon, entrance of, through 



membrane of egg, 42 

 Sphwroearpus, 45 



DonnelUi, 45 



texanus, 45 

 Spirogyra, 27 

 Sponges, 21^. 

 Spores, 29 

 Sporophyte, 29 

 Squashes, 221 

 Sterility, 188ff. 

 Stevenson, 233 

 Stone Age, 258 

 Strasburger, 45 

 Sturtevant, 184 

 Btylonyohia pustulata, 78 

 Sv?ine, 210/., 213 

 Synapsis, 37 

 Syndactyly, 230 



Talmud, Hebraic, 14 

 Tapeworm, 23f. 

 Tobacco, 114, 148, 156 

 corolla length of, 70 

 Tomatoes, 114, 148, 221 

 Toyama, 158 

 Trochelminthes, 21/., 202 

 Tropseolum, 144 

 Tunicates, 23 

 Turanian, 259; race, 258 

 Turbellarians, 23 

 Tuttle, 235 



Ulothrix, 26, 28 



Unit of heredity, 77 



United Kingdom, 257 



United States^ 253ff., 260, 262, 264 



XJstilago maydis, 118 



Venable, 235 

 Verbascum, 142, 144 



